The friction of air causes a vertical retardation equal to 10% of the acceleration due to gravity. The maximum height & time …..

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Q. The friction of air causes a vertical retardation equal to 10% of the acceleration due to gravity.  The maximum height and time to reach the maximum height will be decreased by

(a) 9%, 9%

(b) 11%, 11%

(c) 9%, 10%

(d) 11%, 9%

Ans: (a)

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